When viewers cheer, they use cheermotes and commonly emotes in their cheer messages. Unfortunately, the payload received from EventSub's channel.cheer callbacks only have the raw text as entered by the user, with no indiciation of which portions of that text are cheermotes nor emotes. Thus, I propose the following update to the callback payload, similar to the channel.subscription.message event, that passes along the data for both so that a consumer of EventSub can reconstruct the message:

{
    "subscription": {
        ...
    },
    "event": {
        ...
        "message": {
            "text": "Rah Rah Cheer! cheerwhal1 Cheer100 notACheer101 finite6ThrowBall",
            "cheermotes": [
                {
                    "begin": 16,
                    "end": 26,
                    "prefix": "cheerwhal"
                    "id": "1"
                },
                {
                    "begin": 27,
                    "end": 34,
                    "prefix": "Cheer"
                    "id": "100"
                }
            ],
            "emotes": [
                {
                    "begin": 48,
                    "end": 64,
                    "id": "emotesv2_4133039724974aa59589549eae677d03"
                }
            ]
        },
        ...
    }
}